bump to alpine:3.20 and optimize image using either from:scratch or pyinstaller

docker/medpot/Dockerfile

@@ -1,44 +1,35 @@
-FROM golang:1.21-alpine AS builder
+FROM golang:1.23-alpine AS builder
+#
+ENV GO111MODULE=on \
+    CGO_ENABLED=0 \
+    GOOS=linux
 #
 # Install packages
 RUN apk --no-cache -U add \
-		build-base \
-		git \
-		go \
-		g++ && \
+        build-base \
+        git \
+        g++
 #
 # Setup go, build medpot
-    export GOPATH=/opt/go/ && \
-    export GO111MODULE=off && \
-    mkdir -p /opt/go/src && \
-    cd /opt/go/src && \
-    git clone https://github.com/schmalle/medpot && \
-    cd medpot && \
+RUN mkdir -p /usr/local/go/src/medpot && \
+    git clone https://github.com/schmalle/medpot /usr/local/go/src/medpot && \
+    cd /usr/local/go/src/medpot && \
     git checkout 75a2e6134cf926c35b6017d62542274434c87388 && \
-    cd .. && \
-    go get -d -v github.com/davecgh/go-spew/spew && \
-    go get -d -v github.com/go-ini/ini && \
-    go get -d -v github.com/mozillazg/request && \
-    go get -d -v go.uber.org/zap && \
-    cd medpot && \
+    go mod init github.com/schmalle/medpot && \
+    go mod tidy && \
+    go mod download && \
     cp dist/etc/ews.cfg /etc/ && \
     go build medpot
 #
-FROM alpine:3.19
+FROM scratch
 #
 # Setup medpot
 #
-COPY --from=builder /opt/go/src/medpot/medpot /opt/medpot/medpot
-COPY --from=builder /opt/go/src/medpot/template/*.xml /opt/medpot/
-COPY --from=builder /opt/go/src/medpot/dist/etc/ews.cfg /etc/ews.cfg
-RUN mkdir -p /var/log/medpot && \
-#
-# Setup user, groups and configs
-    addgroup -g 2000 medpot && \
-    adduser -S -s /bin/ash -u 2000 -D -g 2000 medpot && \
-    chown -R medpot:medpot /var/log/medpot
+COPY --from=builder /usr/local/go/src/medpot/medpot /opt/medpot/medpot
+COPY --from=builder /usr/local/go/src/medpot/template/*.xml /opt/medpot/
+COPY --from=builder /usr/local/go/src/medpot/dist/etc/ews.cfg /etc/ews.cfg
 #
 # Start medpot
 WORKDIR /opt/medpot
-USER medpot:medpot
+USER 2000:2000
 CMD ["./medpot"]